simplicis, Rivulus Costa [W. J. E. M.] 2004:104, Figs. 1-2 [aqua, Journal of Ichthyology and Aquatic Biology v. 8 (no. 3); ref. 27824] Swamp near Jabaquara beach, 23°12'26.7"S, 44°43'12.9"W, Parati, Estado do Rio de Janeiro, Brazil, elevation 23 meters. Holotype: UFRJ 5940. Paratypes: UFRJ 5941 (31), 5942 (5, c&s), 5976 (3). •Valid as Rivulus simplicis Costa 2004 -- (Costa 2006:139 [ref. 28875] in subgenus Cynodonichthys, Costa 2007:127 [ref. 29225], Costa 2008:47 [ref. 29622] in subgenus Atlantirivulus, Costa 2008:135 [ref. 29871]). •Valid as Atlantirivulus simplicis (Costa 2004) -- (Costa 2011:244 [ref. 31655]). Current status: Valid as Atlantirivulus simplicis (Costa 2004). Rivulidae: Rivulinae. Distribution: Coastal plains of southeastern Brazil. Habitat: freshwater.